It isn't a matter of translation:
1 John 4:20
New International Version
Whoever claims to love God yet hates a brother or sister is a liar. For whoever does not love their brother and sister, whom they have seen, cannot love God, whom they have not seen.
New Living Translation
If someone says, “I love God,” but hates a fellow believer, that person is a liar; for if we don’t love people we can see, how can we love God, whom we cannot see?
English Standard Version
If anyone says, “I love God,” and hates his brother, he is a liar; for he who does not love his brother whom he has seen cannot love God whom he has not seen.
Berean Standard Bible
If anyone says, “I love God,” but hates his brother, he is a liar. For anyone who does not love his brother, whom he has seen, cannot love God, whom he has not seen.
Berean Literal Bible
If anyone should say, "I love God," and should hate his brother, he is a liar. For the one not loving his brother, whom he has seen, is not able to love God, whom he has not seen.
King James Bible
If a man say, I love God, and hateth his brother, he is a liar: for he that loveth not his brother whom he hath seen, how can he love God whom he hath not seen?
New King James Version
If someone says, “I love God,” and hates his brother, he is a liar; for he who does not love his brother whom he has seen, how can he love God whom he has not seen?
New American Standard Bible
If someone says, “I love God,” and yet he hates his brother or sister, he is a liar; for the one who does not love his brother and sister whom he has seen, cannot love God, whom he has not seen.
NASB 1995
If someone says, “I love God,” and hates his brother, he is a liar; for the one who does not love his brother whom he has seen, cannot love God whom he has not seen.
NASB 1977
If someone says, “I love God,” and hates his brother, he is a liar; for the one who does not love his brother whom he has seen, cannot love God whom he has not seen.
Legacy Standard Bible
If someone says, “I love God,” and hates his brother, he is a liar; for the one who does not love his brother whom he has seen, cannot love God whom he has not seen.
Amplified Bible
If anyone says, “I love God,” and hates (works against) his [Christian] brother he is a liar; for the one who does not love his brother whom he has seen, cannot love God whom he has not seen.
Christian Standard Bible
If anyone says, “I love God,” and yet hates his brother or sister, he is a liar. For the person who does not love his brother or sister whom he has seen cannot love God whom he has not seen.
Holman Christian Standard Bible
If anyone says, “I love God,” yet hates his brother, he is a liar. For the person who does not love his brother he has seen cannot love the God he has not seen.
American Standard Version
If a man say, I love God, and hateth his brother, he is a liar: for he that loveth not his brother whom he hath seen, cannot love God whom he hath not seen.
Aramaic Bible in Plain English
But if a man will say, “I love God”, and he hates his brother, he is lying; for he who does not love his brother who is visible, how is it possible for him to love God who is invisible?
Contemporary English Version
But if we say we love God and don't love each other, we are liars. We cannot see God. So how can we love God, if we don't love the people we can see?
Douay-Rheims Bible
If any man say, I love God, and hateth his brother; he is a liar. For he that loveth not his brother, whom he seeth, how can he love God, whom he seeth not?
English Revised Version
If a man say, I love God, and hateth his brother, he is a liar: for he that loveth not his brother whom he hath seen, cannot love God whom he hath not seen.
GOD'S WORD® Translation
Whoever says, "I love God," but hates another believer is a liar. People who don't love other believers, whom they have seen, can't love God, whom they have not seen.
Good News Translation
If we say we love God, but hate others, we are liars. For we cannot love God, whom we have not seen, if we do not love others, whom we have seen.
International Standard Version
Whoever says, "I love God," but hates his brother is a liar. The one who does not love his brother whom he has seen cannot love the God whom he has not seen.
Literal Standard Version
if anyone may say, “I love God,” and may hate his brother, he is a liar; for he who is not loving his brother whom he has seen, how is he able to love God whom he has not seen?
Majority Standard Bible
If anyone says, “I love God,” but hates his brother, he is a liar. For anyone who does not love his brother, whom he has seen, how can he love God, whom he has not seen?
New American Bible
If anyone says, “I love God,” but hates his brother, he is a liar; for whoever does not love a brother whom he has seen cannot love God whom he has not seen.
NET Bible
If anyone says "I love God" and yet hates his fellow Christian, he is a liar, because the one who does not love his fellow Christian whom he has seen cannot love God whom he has not seen.
New Revised Standard Version
Those who say, “I love God,” and hate their brothers or sisters, are liars; for those who do not love a brother or sister whom they have seen, cannot love God whom they have not seen.
New Heart English Bible
If anyone says, "I love God," and hates his brother, he is a liar; for he who does not love his brother whom he has seen, cannot love God whom he has not seen.
Webster's Bible Translation
If a man sayeth, I love God, and hateth his brother, he is a liar. For he that loveth not his brother, whom he hath seen, how can he love God, whom he hath not seen?
Weymouth New Testament
If any one says that he loves God, while he hates his brother man, he is a liar; for he who does not love his brother man whom he has seen, cannot love God whom he has not seen.
World English Bible
If a man says, “I love God,” and hates his brother, he is a liar; for he who doesn’t love his brother whom he has seen, how can he love God whom he has not seen?
Young's Literal Translation
if any one may say -- 'I love God,' and his brother he may hate, a liar he is; for he who is not loving his brother whom he hath seen, God -- whom he hath not seen -- how is he able to love?